Dresses are a sleeveless style, poly/cotton blend for durability. They can be machine washed but we recommend they be washed inside-out and air dried. Made to order. XSmall 8" Small 10" Medium 12" Large 14" XLarge 16" XXLargfe 18" XXXLarge 20" Measure the length of your dogs back top. From the base of the neck to the base of the tail.